Determination of Polarization Voltage of Electromagnetic Flow Meter Electrode

Abstract: The information on the measurement of the polarization voltage of the electrode of the electromagnetic flowmeter is provided by the excellent flowmeter and flowmeter manufacturers and quotation manufacturers. The electromagnetic flowmeter measuring the polarization voltage between the electrode and the liquid will help to determine whether the failure of the zero point instability or the output sloshing is caused by the electrode being contaminated or covered. Use the 2V DC gear of the digital multimeter to measure the polarization voltage between the two electrodes and the ground respectively (. More flowmeter manufacturers choose the model and price quotation. You are welcome to inquire. The following is the determination of the polarization voltage of the electromagnetic flowmeter meter electrode. The article details. The electromagnetic flowmeter measuring the polarization voltage between the electrode and the liquid will help to judge whether the zero point instability or the output shaking fault is caused by the electrode being contaminated or covered. Use the digital multimeter 2V DC gear to measure the two electrodes respectively Polarization voltage between the ground and the ground (the electromagnetic flowmeter can be measured without power failure or without power failure). If the two measured values ​​are nearly equal, it means that the electrode is not polluted or covered, otherwise the electrode is polluted or covered. The magnitude of the polarization voltage depends on the 'electrode potential' of the electrode material and the properties of the liquid, and the measured value may be between a few mV and several hundreds of mV. Because the contamination of the two electrodes during operation cannot be completely symmetrical, so the two electrodes The voltage on the sensor forms an asymmetric common-mode voltage. The asymmetric common-mode voltage becomes a differential mode signal, causing zero offset. Measurement of signal cable interference The signal cable is subject to external electrostatic induction and electromagnetic induction interference, which will cause the zero point of the electromagnetic flowmeter to change. .In order to judge whether the zero point change is affected by the interference potential of the signal cable, it is necessary to determine the general scope of the interference and the degree of influence on the electromagnetic flowmeter. The two electrodes are measured as shown in Figure 7-10 and in the 'Measurement of Electrode Contact Resistance' above. The general resistance values ​​RA and RR of , respectively, according to Figures a and b, the difference between the measured zero points should be within 1% of the full scale value or its basic error range. The following points should be paid attention to when measuring: 1. Pay attention to the connection Input RA and RB should not be induced by power supply interference; 2. During the measurement, the zero point of the converter may have a slight change (usually an increase) compared with the original connector measurement, and it is generally considered that the change does not exceed about 5%. 3. Figure 7-10 only shows the circuit of the reconnected part, and the other circuits are still as they are; 4. The surrounding environment of the sensor during measurement is as much as possible when the fault occurs. It is better if the nearby motor can be tested for power on and off. The above is the whole content of this article, you are welcome to inquire about the flowmeter selection, quotation, etc. of our manufacturer. 'Determination of Polarization Voltage of Electromagnetic Flowmeter Meter'
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